Voltage regulator



June 5, 1923.

A. F. NESBT VOLTAGE REGULATOR Filed Aug. 2v, 1921 fo e@ M M i I m P 1,WV

Patented ,June 5, 1923-.

UNITEDM STATES PMATENT oFFlcE.

VOLTAGE REGULATOR.

Application led August 27, 1921. Serial No. 495,992.

To' all whom it may concem.'

Be it known that I, ARTHUR F. Nnsrr, a citizen of the United States, andresident of Wilkinsbur'g, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inVoltage Regulators, of which the following is a specification.

This invention relates to Voltage regulators and'more particularly toregulators for .controlling the voltage of power circuits, and.v has forits object the provision of such a regulator that will have@ no movingparts, and, therefore, will eliminate the making of adjustments as isnecessary with the regulators now in use.

Another object is to provide a voltage regulator that will operatewithout opening or shutting any vparts of the circuits of which it is apart. f

A further object is to provide a voltage regulator having resistanceelements which will'operate only through a varying of theirconductivity, 'due to varying temperatures.

The operation, construction and arrangement of parts of the inventionare. fully described in the following specification, 'and illustrated inthe accompanying drawings, in whichy Figure 1 is a sectional elevationthroughl la regulator constructed in accordance with connected therewithfor regulating the 'output of said generator.

Figure 3 1s an alternating current generator wiring diagram showing aregulator constructed in accordance with this invention connectedtherewith for regulating thev .output of said generator.

Referring particularly to the drawings, the numeral 2 designates thehollow 'body of the regulator which may be in the form of a vacuum tubeor nitrogen tube. The

, body portion 2, which maygbe made of glass,

porcelain, or the like, has an open bottom which is closed by a cementbase or plug 3, and has leadsit and 4 secured therein.

. l*The-,upper face of the plug 3 is formed dishedor concave and" has asurrounding rim 5 on which is mounted a disk-like sup porting base 6.The disk-like base 6 is provided with `a central aperture which has itsupper portion enlarged to form an annular shoulder 7. A comparativelythin tubular tion of its depth to form a shoulder 10 is' l mounted onthe upper end of the tubular support 8, and has its Vside edges abuttingthe inner surface of said body, and serves to support and hold the upperend of saidI support rigid.

Suitable metal resistance strips 11 and 11a are secured to the leads 4and Jlrespectively. The strip 1l has itsu ends Secured to the leads 4and is wound spirally around the interior surface of the tubular support8 and secured to or looped around a but# vton A12 adjacent the top ofsaid tube. The f strip 11a has its ends secured to 'the leads 4a and iswound sp-irally around the outer surface of the tubular support 8 andsecured to or looped around a button 13 adjacent the top of said tube.The oonvolutions of the strips 11 and 11a follow a parallel course alongthe support 8 so that the outer strip 11a overlies the inner strip.

In the operation of the regulator the temperature of the resistancestrips which are connected in different circuits will vary, and the riseor fall of temperature of, one strip will be transmitted throughthe'thin wall of the tubular support 8 to the other strip', and

vsince the conductivity or resistance quality ofk the strips vary withtheir temperature,

ythe current value of oney circuit will control In Figure 2'the numeral15 designates the armature of a 'direct current generator which has afield 16 connected across the terminals 17V and 18 by wires 16 and 16"to provide'an exciting circuit. A rheostat 19 is in circuit with thewire16h from the terminal 17, and the resistance strip 11a isA incircuit with the wire 16al from the terminal 18. It will be noted,however, that the rheostat 19, after being set to a specific load, islocked in position and all variation 'in the load is controlled by theregulator X,

constructed in accordance to .this invention. The current output or leadcircuit from the generator passes from the terminals 17 and 18 throughwires 20 and 21 to the lamps 22 or other load, and the resistance strip11 its resistance quality or decrease its conductivity, so as todecrease the value of thev eld exciting current.

In Figure 3 the regulator X is shown for controlling an alternatingcurrent generator having the armature 24 and lield 25.

y The field 25 isexcited from a direct current enerator having armature26 and eld 27.

`he eld 27 is. connected across the terminals 28 and 29 ofthe armature26 by Wires 30 and 31.' A rheostat 32 is in circuit with the wire 30leading from terminal 28 and the resistance strip 11a' is in circuitwith the wire 31 leading from the terminal 29. The exciting current tothe field 25 of the alternating current generator, passes from theterminals 28 and 29 through wires 33 and 34. The load current passesfrom the terminals 35 and 36 of the alternating current generatorthrough wires 37 and 38 to the lamps 39 or other load, and .theresistance strip 11 of the regulator X is connected in circuit with thewire 38 so thatas the load is increased the strip 11` will becomeheated, such heat being transmitted to the resistance strip 11l1 anddecreasing its resistance quality or increasing its-conductivity so asto increase the excitf ing current to the field 27 of the direct currentgenerator or exciter. If the load should suddenly drop or decrease, the,reverse acy tion will take place. That is, the resistance strip 11 willcool, thus allowing the strip 11a to cool and increase its resistancequality or decrease its conductivity, so as to decrease the value ofthel current to the direct current exciter field 27.

While only one specific embodiment of this invention has beenillustrated and described, various modified forms and designs willreadily suggest themselves to those skilled in the art, and, therefore,it is to be expressly understood that I do not wish to be limited tothat form illustrated and-'described, since various modifications may bemade without departing from the spirit of the invention as described inthe appended claims.

l claim 1. A voltage regula-tor comprising a hollow air tight bodyportion, a thin tubular insulating support rigidly mounted in said bodyportion, a metal resistance strip coiled around the interior surface ofsaid support, a second metal resistance stripv coiled around the outersurface of said tubular support, said strips having their convolutionsarranged in a parallel course along said support so that said outerstrip overlies said -inner strip, said strips being formed of such metalthat their conductivity will vary as'they becomeA heated, and saidtubular insulating member being adapted to readily transmit the heatfrom one strip to the other, leads secured to said strips, and each ofsaid strips being adapted to be connected to separate electricalcircuits.

2. A voltage regulator comprising a hollow air tight body portion, atubular insulating support rigidly 'mounted in said body portion, ametal resistance strip coiled around the interior surface of saidsupport, a second metal resistance strip coiled around the outer surfaceof said tubular support, said strips having their convolutions arrangedin a parallel course along said support so that said outer stripoverlies said inner strip, said strips being formed of such metal thattheir conductivity will vary as they become heated, and said tubularinsulating member being adapted to readily transmit the heat from onestrip to the other, each of said resistance strips being adapted to beconnected to separate electrical circuits. Y, y

3. A voltage regulator comprising a hollow air tight body portion, atubular insulating support rigidly mounted in said body portion, a metalresistance strip coiled around the interior surface of said support asecond strip coiled around the outer surface of said support, leadssecured to said resistance strips and extending out- Wardly through,said fbody portion,- each of said resistance strips being adapted to 4.A voltage "regulator comprisinga holi low air tight body portion, an,insulating support rigidly mounted in said body portion, a metalresistance strip coiled around and secured to the interior surface ofsaid support, a second strip coiled around and securedJ to the outersurface of said supbe connected to separate electricall circuits,

port. leads secured to said resistance strips tions in said circuits,and said strips being and extending outwardly through said body soarranged with relation to each other that portion. each of saidresistance strips being the heat from one strip will be transmitted 10adapted to be connected to separate electo the other strip to vary itsconductivity.

trcal circuits, said strips beingr formed of In testimony whereof I havehereunto set such metal that their conductivity Will vary my hand. asthey become heated by the current varia- ARTHUR F. NESBIT.

